RequestBuilder externa server java

I have a RequestBuilder:
// Send request to server and catch any errors.
RequestBuilder builder = new RequestBuilder(RequestBuilder.POST,
url);

try {
Request request = builder.sendRequest(null, new
RequestCallback() {
public void onError(Request request, Throwable exception) {
displayError("Couldn't retrieve JSON");
}

public void onResponseReceived(Request request, Response
response) {
if (200 == response.getStatusCode()) {
updateTable(asArrayOfStockData(response.getText()));
} else {
displayError("Couldn't retrieve JSON (" +
response.getStatusText()
+ ")");
}
}
});
} catch (RequestException e) {
displayError("Couldn't retrieve JSON");
}
Where URL is an external server for exemple "http://localhost:8080/
MyApplication/MyExternalServlet
When I recived the request I have the string data, but in the response
in applicatione GWT is always empty.
Why?

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